Burris vs Vortex

Looking to put a red dot optic onto a milled pistol slide. Needing recommendations, looking at the Burris fastfire 3 Vortex viper and the Vortex venom. I'm more drawn to the Burris for its looks / price and seems to be a popular choice. I just don't want to pull the trigger and realise there were better options around the same price point.